The "xorg" icon is used by KWin and the Task Manager in case a window provides no icon. Currently, it would just show a blank spot which looks strange. Oxygen had an xorg icon. Reproducible: Always
Git commit eb1e4a242df7068b438c328fa2cca04c963f42ed by andreas kainz. Committed on 19/09/2016 at 10:48. Pushed by andreask into branch 'master'. add xorg app icon A +733 -0 icons/apps/48/xorg.svg http://commits.kde.org/breeze-icons/eb1e4a242df7068b438c328fa2cca04c963f42ed